package org.liufeng.course.util;
  
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;  
   
 import javax.imageio.ImageIO;  
import javax.servlet.http.HttpServletRequest;

 import java.io.File;  
 import java.io.OutputStream;  
 import java.io.IOException;  
import java.util.Hashtable;
import java.awt.image.BufferedImage;  
   
   
 public final class erweimaUtil {  
   
   private static final int BLACK = 0xFF000000;  
   private static final int WHITE = 0xFFFFFFFF;  
   
   private erweimaUtil() {}  
   
     
   public static BufferedImage toBufferedImage(BitMatrix matrix) {  
     int width = matrix.getWidth();  
     int height = matrix.getHeight();  
     BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
     for (int x = 0; x < width; x++) {  
       for (int y = 0; y < height; y++) {  
         image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);  
       }  
     }  
     return image;  
   }  
   
     
   public static void writeToFile(BitMatrix matrix, String format, File file)  
       throws IOException {  
     BufferedImage image = toBufferedImage(matrix);  
     if (!ImageIO.write(image, format, file)) {  
       throw new IOException("Could not write an image of format " + format + " to " + file);  
     }  
   }  
   
     
   public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)  
       throws IOException {  
     BufferedImage image = toBufferedImage(matrix);  
     if (!ImageIO.write(image, format, stream)) {  
       throw new IOException("Could not write an image of format " + format);  
     }  
   }  
   
   
   public static void getMain(String url,String content,String name) throws Exception {  
	   String text = content;  
       int width = 300;  
       int height = 300;  
       //二维码的图片格式  
       String format = "gif";  
       Hashtable hints = new Hashtable();  
       //内容所使用编码  
       hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  
       BitMatrix bitMatrix = new MultiFormatWriter().encode(text,  
               BarcodeFormat.QR_CODE, width, height, hints);
       System.out.print(url);
       //生成二维码  
       File outputFile = new File(url+name+".gif");  
       erweimaUtil.writeToFile(bitMatrix, format, outputFile);
   }
   
   public static void main(String[] args) throws Exception {  
	   getMain("d:","123456","123");
   }
   
 }  
